The Impact of Image Registration for Ablation Orientation on Clinical Outcomes After Wavefront-Optimized Refractive Surgery in Eyes with Myopia and Astigmatism

Figures & data

Table 1 Demographics, Preoperative Refractive Status and Follow-Up Time

n	IR	NO IR	p
	112	126
Age (years)	30.0 ± 7.2 (18 to 54)	30.2 ± 7.0 (18 to 55)	0.87
Sex (M/F)	60/52	64/62	0.67
Preoperative refraction (D)
Sphere	−2.82 ± 1.79 (−6.75 to 0.00)	−2.64 ± 1.70 (−7.50 to 0.00)	0.43
Cylinder	2.43 ± 0.84 (1.50 to 5.25)	2.33 ± 0.66 (1.50 to 4.75)	0.27
Spherical equivalent	−4.04 ± 1.79 (−8.00 to −0.88)	−3.80 ± 1.67 (−8.25 to −1.00)	0.30
Preoperative BCVA (logMAR)	0.00 ± 0.01 (−0.10 to 0.04)	−0.01 ± 0.03 (−0.10 to 0.06)	< 0.01
Follow-up time (days)	89 ± 32 (20 to 168)	87 ± 27 (27 to 157)	0.73
Follow-up between 30 and 120 days	90/112 (80%)	106/126 (84%)	0.45

Abbreviations: IR, iris registration, D, diopter, BCVA, best-corrected visual acuity; logMAR, log of the minimum angle of resolution.

Table 2 Clinical Outcomes (n = 112 IR, 126 NO IR)

Outcome Variables	Group	Mean	Std. Dev.	Minimum	Maximum	p
Sphere (D)	IR	0.08	0.22	−0.50	1.00	0.01
	NO IR	0.01	0.19	−0.50	1.00
Cylinder (D)	IR	−0.11	0.20	−0.75	0.00	0.46
	NO IR	−0.13	0.25	−1.25	0.00
MRSE (D)	IR	0.03	0.22	−0.50	0.75	< 0.001
	NO IR	−0.05	0.17	−0.63	0.38
BCVA (logMAR)	IR	−0.04	0.05	−0.12	0.04	< 0.001
	NO IR	−0.02	0.05	−0.10	0.14
UCVA (logMAR)	IR	−0.03	0.05	−0.12	0.16	< 0.001
	NO IR	0.00	0.06	−0.10	0.34

Abbreviations: Std. Dev, standard deviation; D, diopter; IR, iris registration; MRSE, mean refraction spherical equivalent; BCVA, best-corrected visual acuity; UCVA, uncorrected visual acuity; logMAR, log of the minimum angle of resolution.

Figure 1 Residual refractive cylinder distribution by group.

Abbreviation: IR, iris registration.

Figure 2 Uncorrected visual acuity by group.

Abbreviation: IR, iris registration.

Figure 3 Best corrected visual acuity by group.

Abbreviation: IR, iris registration.

Table 3 Difference Between Preoperative BCVA and Postoperative UCVA and BCVA

Comparison to Preoperative BCVA	Group	Total	1+ Lines Better	Within 1 Line	1+ Lines Worse
Postoperative UCVA	IR	112	25 (22%)	86 (77%)	1 (1%)
	NO IR	126	10 (8%)	109 (87%)	7 (6%)
Postoperative BCVA	IR	112	33 (29%)	79 (71%)	0
	NO IR	126	13 (10%)	112 (89%)	1 (1%)

Abbreviations: IR, iris registration; BCVA, best-corrected visual acuity; UCVA, uncorrected visual acuity.